Change vars to vals, possible because method 'addTagresultToTaglib' is now changed

public/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/tools/SageCreateLibrary.scala

@@ -88,8 +88,7 @@ object SageCreateLibrary extends ToolCommand {
     }
   }
 
-  var tagRegex: Regex = null
-  var geneRegex = """ENSG[0-9]{11}""".r
+  val geneRegex = """ENSG[0-9]{11}""".r
 
   val tagGenesMap: mutable.Map[String, TagGenes] = mutable.Map()
 
@@ -114,7 +113,7 @@ object SageCreateLibrary extends ToolCommand {
 
     if (!commandArgs.input.exists) throw new IllegalStateException("Input file not found, file: " + commandArgs.input)
 
-    tagRegex = (commandArgs.tag + "[CATG]{" + commandArgs.length + "}").r
+    val tagRegex = (commandArgs.tag + "[CATG]{" + commandArgs.length + "}").r
 
     var count = 0
     logger.info("Reading fasta file")

public/biopet-framework/src/test/scala/nl/lumc/sasc/biopet/tools/SageCreateLibaryTest.scala

@@ -85,7 +85,7 @@ class SageCreateLibaryTest extends TestNGSuite with MockitoSugar with Matchers {
     val reader = FastaReaderHelper.readFastaDNASequence(new File(input))
 
     val records = reader.iterator.toList
-    tagRegex = ("CATG" + "[CATG]{" + 17 + "}").r
+    val tagRegex = ("CATG" + "[CATG]{" + 17 + "}").r
 
     val record1 = records(0)
     val record2 = records(1)